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Groovy example source code file (DefaultGrailsDomainClassInjector.java)

This example Groovy source code file (DefaultGrailsDomainClassInjector.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Groovy tags/keywords

arraylist, classnode, expression, iterator, iterator, list, list, mapentryexpression, mapexpression, methodnode, net, network, propertynode, propertynode, reflection, string, string, util

The Groovy DefaultGrailsDomainClassInjector.java source code

/*
 * Copyright 2004-2005 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.codehaus.groovy.grails.compiler.injection;

//import org.apache.commons.logging.Log;
//import org.apache.commons.logging.LogFactory;

import org.codehaus.groovy.ast.*;
import org.codehaus.groovy.ast.expr.*;
import org.codehaus.groovy.ast.stmt.ReturnStatement;
import org.codehaus.groovy.ast.stmt.Statement;
import org.codehaus.groovy.control.CompilePhase;
import org.codehaus.groovy.control.SourceUnit;
import org.codehaus.groovy.transform.ASTTransformation;
import org.codehaus.groovy.transform.GroovyASTTransformation;

import java.lang.reflect.Modifier;
import java.net.URL;
import java.util.*;

/**
 * This is substantially the same code from Grails, except some references de-referenced
 * and the macro class added.
 *
 * Default implementation of domain class injector interface that adds the 'id'
 * and 'version' properties and other previously boilerplate code
 *
 * @author Graeme Rocher
 *
 * @since 0.2
 *
 * Created: 20th June 2006
 */
@GroovyASTTransformation(phase= CompilePhase.CANONICALIZATION)
public class DefaultGrailsDomainClassInjector implements ASTTransformation {
        //GrailsDomainClassInjector {

    //private static final Log LOG  = LogFactory.getLog(DefaultGrailsDomainClassInjector.class);


    public void visit(ASTNode[] nodes, SourceUnit source) {
        performInjection((ClassNode) nodes[1]);
    }

    public void performInjection(ClassNode classNode) {
        if(shouldInject(classNode)) {
            injectIdProperty(classNode);

            injectVersionProperty(classNode);

            injectToStringMethod(classNode);

            injectAssociations(classNode);

        }
    }

    public boolean shouldInject(URL url) {
        return true; //return GrailsResourceUtils.isDomainClass(url);
    }

    private boolean shouldInject(ClassNode classNode) {
        //String fullName = GrailsASTUtils.getFullName(classNode);
        //String mappingFile = GrailsDomainConfigurationUtil.getMappingFileName(fullName);

        //if(getClass().getResource(mappingFile)!=null) {
            //if(LOG.isDebugEnabled()) {
                //LOG.debug("[GrailsDomainInjector] Mapping file ["+mappingFile+"] found. Skipping property injection.");
            //}
            //return false;
        //}
        return true;
    }

    private void injectAssociations(ClassNode classNode) {

        List properties = classNode.getProperties();
        List propertiesToAdd = new ArrayList();
        for (Iterator p = properties.iterator(); p.hasNext();) {
            PropertyNode pn = (PropertyNode) p.next();
            final boolean isHasManyProperty = pn.getName().equals(/*GrailsDomainClassProperty.*/RELATES_TO_MANY) || pn.getName().equals(/*GrailsDomainClassProperty.*/HAS_MANY);
            if(isHasManyProperty) {
                Expression e = pn.getInitialExpression();
                propertiesToAdd.addAll(createPropertiesForHasManyExpression(e,classNode));
            }
            final boolean isBelongsTo = pn.getName().equals(/*GrailsDomainClassProperty.*/BELONGS_TO);
            if(isBelongsTo) {
                Expression e = pn.getInitialExpression();
                propertiesToAdd.addAll(createPropertiesForBelongsToExpression(e,classNode));
            }
        }
        injectAssociationProperties(classNode,propertiesToAdd);
    }

    private Collection createPropertiesForBelongsToExpression(Expression e, ClassNode classNode)
    {
        List properties = new ArrayList();
        if(e instanceof MapExpression) {
            MapExpression me = (MapExpression)e;
            List mapEntries = me.getMapEntryExpressions();
            for (Iterator i = mapEntries.iterator(); i.hasNext();) {
                MapEntryExpression mme = (MapEntryExpression) i.next();
                String key = mme.getKeyExpression().getText();

                String type = mme.getValueExpression().getText();

                properties.add(new PropertyNode(key,Modifier.PUBLIC, ClassHelper.make(type) , classNode, null,null,null));
            }
        }

        return properties;
    }

    private void injectAssociationProperties(ClassNode classNode, List propertiesToAdd) {
        for (Iterator i = propertiesToAdd.iterator(); i.hasNext();) {
            PropertyNode pn = (PropertyNode) i.next();
            if(!/*GrailsASTUtils.*/hasProperty(classNode, pn.getName())) {
                //if(LOG.isDebugEnabled()) {
                //    LOG.debug("[GrailsDomainInjector] Adding property [" + pn.getName() + "] to class [" + classNode.getName() + "]");
                //}
                classNode.addProperty(pn);
            }
        }
    }

    private List createPropertiesForHasManyExpression(Expression e, ClassNode classNode) {
        List properties = new ArrayList();
        if(e instanceof MapExpression) {
            MapExpression me = (MapExpression)e;
            List mapEntries = me.getMapEntryExpressions();
            for (Iterator j = mapEntries.iterator(); j.hasNext();) {
                MapEntryExpression mee = (MapEntryExpression) j.next();
                Expression keyExpression = mee.getKeyExpression();
                String key = keyExpression.getText();
                addAssociationForKey(key,properties,classNode);
            }
        }
        return properties;
    }

    private void addAssociationForKey(String key, List properties, ClassNode classNode) {
            properties.add(new PropertyNode(key, Modifier.PUBLIC, new ClassNode(Set.class), classNode,null, null, null));
    }

    private void injectToStringMethod(ClassNode classNode) {
        final boolean hasToString = /*GrailsASTUtils.*/implementsZeroArgMethod(classNode, "toString");

        if(!hasToString) {
            GStringExpression ge = new GStringExpression(classNode.getName() + " : ${id}");
            ge.addString(new ConstantExpression(classNode.getName()+" : "));
            ge.addValue(new VariableExpression("id"));
            Statement s = new ReturnStatement(ge);
            MethodNode mn = new MethodNode("toString",Modifier.PUBLIC,new ClassNode(String.class), new Parameter[0],new ClassNode[0],s);
            //if(LOG.isDebugEnabled()) {
            //    LOG.debug("[GrailsDomainInjector] Adding method [toString()] to class [" + classNode.getName() + "]");
            //}
            classNode.addMethod(mn);
        }
    }

    private void injectVersionProperty(ClassNode classNode) {
        final boolean hasVersion = /*GrailsASTUtils.*/hasProperty(classNode, /*GrailsDomainClassProperty.*/VERSION);

        if(!hasVersion) {
            //if(LOG.isDebugEnabled()) {
            //    LOG.debug("[GrailsDomainInjector] Adding property [" + GrailsDomainClassProperty.VERSION + "] to class [" + classNode.getName() + "]");
            //}
            classNode.addProperty( /*GrailsDomainClassProperty.*/VERSION, Modifier.PUBLIC, new ClassNode(Long.class), null, null, null);
        }
    }

    private void injectIdProperty(ClassNode classNode) {
        final boolean hasId = /*GrailsASTUtils.*/hasProperty(classNode,/*GrailsDomainClassProperty.*/IDENTITY);

        if(!hasId) {
            //if(LOG.isDebugEnabled()) {
            //    LOG.debug("[GrailsDomainInjector] Adding property [" + GrailsDomainClassProperty.IDENTITY + "] to class [" + classNode.getName() + "]");
            //}
            classNode.addProperty( /*GrailsDomainClassProperty.*/IDENTITY, Modifier.PUBLIC, new ClassNode(Long.class), null, null, null);
        }
    }


    //***************************************************************
    // from GrailsASTUtils
    //***************************************************************
    /**
     * Returns whether a classNode has the specified property or not
     *
     * @param classNode The ClassNode
     * @param propertyName The name of the property
     * @return True if the property exists in the ClassNode
     */
    public static boolean hasProperty(ClassNode classNode, String propertyName) {
        if(classNode == null || propertyName == null || "".equals(propertyName.trim()))
            return false;

        List properties = classNode.getProperties();
        for (Iterator i = properties.iterator(); i.hasNext();) {
            PropertyNode pn = (PropertyNode) i.next();
            if(pn.getName().equals(propertyName))
                return true;
        }
        return false;
    }

    /**
     * Tests whether the ClasNode implements the specified method name
     *
     * @param classNode The ClassNode
     * @param methodName The method name
     * @return True if it does implement the method
     */
    public static boolean implementsZeroArgMethod(ClassNode classNode, String methodName) {
        return implementsMethod(classNode, methodName, new Class[0]);
    }


    /**
     * Tests whether the ClassNode implements the specified method name
     *
     * @param classNode The ClassNode
     * @param methodName The method name
     * @param argTypes
     * @return True if it implements the method
     */
    private static boolean implementsMethod(ClassNode classNode, String methodName, Class[] argTypes) {
        List methods = classNode.getMethods();
        for (Iterator i = methods.iterator(); i.hasNext();) {
            MethodNode mn = (MethodNode) i.next();
            final boolean isZeroArg = (argTypes == null || argTypes.length ==0);
            boolean methodMatch = mn.getName().equals(methodName) && isZeroArg;
            if(methodMatch)return true;
            // TODO Implement further parameter analysis
        }
        return false;
    }

    //***************************************************************
    // from GrailsDomainClassProperty
    //***************************************************************
    private static final String RELATES_TO_MANY = "relatesToMany";
    private static final String BELONGS_TO = "belongsTo";
    private static final String HAS_MANY = "hasMany";
    private static final String IDENTITY = "id";
    private static final String VERSION = "version";
}

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